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Routing & Switching · Advanced

MPLS Traffic Engineering (MPLS TE)

Steering traffic along explicit, constraint-based paths using RSVP-TE tunnels to use network capacity efficiently.

Definition

IGP extensions (OSPF-TE, IS-IS TE) flood link bandwidth, affinities and TE metrics. Headends run CSPF to compute paths and signal them with RSVP-TE. TE tunnels can be steered using autoroute announce, static routes or PBR, and support fast reroute.

Example

interface Tunnel1 / tunnel mode mpls traffic-eng / tunnel mpls traffic-eng path-option 1 dynamic

Exam tip

TE tunnels are unidirectional and need autoroute or a route to attract traffic.

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